Indicating circuit



April 2 4, 1951V T. REHM I INDICATING CIRCUIT Filed NOv. 22, 1948 /N VE N TOR A 7' TOR/VEV Patented ,'Apr. 24, 195i UNITED STATI:

S PATENT OFFICE INDICATING CIRCUIT Theodore C. Rehm, Islip, N.V Y., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application November 22, 1948, YSerial N o. 61,503

4 Claims.

This invention relates to indicating circuits and more particularly to circuits for indicating the number of conductors energized in a plurality of conductor groups.

In electrical registering, recording and intelligence-transmitting systems, it is common practice to indicate or transmit a series of digits or characters by energizing combinations of conductors in a group of conductors for each digit Vany one of twenty digits or characters may be indicated kin each groupby energizing a com-` bination of either two or three conductors are not generally used because of the impossibility of 4detecting false operation. If two conductors are energized in a group and a third conductor ofthe group is accidentally energized, or if three conductors are energized but one of them fails to produce the indicated response, a wrong character would be indicated and there is no way of determining that an error has been made. However, if a predetermined number of characters are transmitted by energizing three conductors for each, and the remainder of the characters ,are transmitted by energizing two conductors for each, a'character is indicated in each group and an additional character is indicated by the combination of groups having three conductors energized in each. A system of this kind is shown f lin the copending application of C. Clos Serial No. `776,061 filed September 25, 1947, now Patent No. 2,470,145, dated May 17, 1949.

entfrom the following description, the appended claims, and the drawing which shows the invention applied to a system having five groups of iive conductors each.

Referring to the drawing, each of the conductors in the ve groups of Iconductors AI A5,'BI B5,CI C5, DI D5 and El E5 is connected to the winding of one of the relays ARI ARE, BRI BR5, CRI CRS, DRI DRE, and ERI so that when any of said conductors are grounded, theassociated'relays are thereby operated. A combination of two relays operated in any group may have any desired signicance. In the system contemplated herein, the operation of the remaining three relays of the group, has the same signicance. For example, relays operated in the group ARI- AR5 may signify digits as follows:

Relays Operated Relays Operated' .Digit i ARS, Am, A A112, AR4, ARs

AR1,AR2 AR1,AR3 ARQ, ARS Am, ARA A32, A114 ARS, AR4 ARi, A115 A112, A115 ARs, A115 Am, A112, ARA ARA, AR5

The significance of the relays operated in the group described above. The relays ARI ARS, BRI BR5, CRI CBS, DRI .DR5, and ERI ERE, may, of course, be provided with additional armatures to control registering, recording, indicating, or other similar kdevices or to give visual indication of their operation.

The grounding of a combination of two of the conductors PI P5 may also have any desired signicance, which may be similar to the signicance of the grounding of two conductors in any of the groups AI Y. A5, BI B5, CI...C5,DI ...D5,andEI ...E5,asde

Vscribed above and as follows:

Conductors Grounded Conductors PI P5 may each be connected to a relay or other device responsive to ground thereon for indicating the conductors grounded or for any desired purpose.

To indicate six digits by means of the circuit shown on the drawing the appropriate two of the conductors in each of Ythree of the groups ,of said terms and expressions,

invention. The terms and expressions Which I have used in reference to the invention and its elements are used as terms of description and not of limitation and I have no intention, by the use of excluding thereby equivalents of the features shown and described or portions thereof but, on the contrary, intend to include therein any and all equivalents and modiiications which may be employed Without departing from the spirit of the invention.

What is claimed is:

l. An indicating circuit comprising in combination groups of conductors, one number of which is normally energized in a number of said groups and another number oi which is normally energized in the remainder of said groups, and

means for indicating when a normal number of conductors is energized in each of said groups.

2. An indicating circuit comprising in combination groups of conductors, one number of which is normally energized in a number of said groups and another number of which is normally energized-in the remainder of said groups, means `for indicating the number of conductors energized in each of said groups, means for indicating the groups in which said other number of conductors is energized, and means for indicating when a normal number of conductors is energized in each of said groups.

4. An indicating circuit comprising in combination groups of conductors, one number of which is normally energized in a number of said groups and another number of which is normally energized in the remainder of said groups, iirst relays each responsive to the energization of one or said conductors, second relays responsive te said first relays, and a relay responsive to said first and second relays for indicating when a normalnumber of conductors is energized in each of said groups.

lTHEODORE C, REI-IM.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,972,985 Gardner Sept. 11, 1934 2,451,319 Candy et al Oct. 12, 1948 2,460,702 Mallery Feb. 1, 1949 2,468,112 Rosen Apr. 26, 1949 

